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A female animal with genotype A/a; B/b is crossed with a double recessive male a/a; b/b....

A female animal with genotype A/a; B/b is crossed with a double recessive male a/a; b/b. Their progeny include:
452 A/a; B/b
459 a/a; b/b

72 A/a; b/b

67 a/a; B/b

How many map units apart are loci A and B?

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